A064776 a(n) is smallest number >= a(n-1) such that a(n) plus any set of the previous values of the sequence is a nonsquare.

2, 3, 3, 5, 21, 24, 24, 80, 80, 80, 480, 480, 720, 1200, 2000, 8400, 9600, 9600, 32000, 32000, 32000, 192000, 192000, 288000, 480000, 800000, 3360000, 3840000, 3840000, 12800000, 12800000, 12800000, 76800000, 76800000, 115200000, 192000000

Offset: 1

Author

Jonathan Ayres (jonathan.ayres(AT)btinternet.com), Oct 18 2001

Keywords

• nonn

Comments

Why do so many terms end with a string of zeros? - Zak Seidov, Jan 01 2008

Examples

			a(3) = 3 because possible sums are 3, 3+a(1), 3+a(2), 3+a(1)+a(2) = 3, 3+2, 3+3, 3+2+3 = 3,5,6,8, all of which are nonsquares.
		

Crossrefs

Cf. A133662.

Cf. A133662.

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Oct 10 2003

More terms and better definition from Don Reble, Jan 01 2008